Heating device for annular component and annular cavity thereof

Abstract

A heating device for an annular component is provided. The heating device is configured to heat the annular component via hot gas flow, and includes a gas flow heater, a draught fan, and an annular cavity for accommodating the annular component. An outer wall of the annular cavity is provided with a gas flow inlet and a gas flow outlet, the gas flow heater heats a gas flow, and the draught fan enables the gas flow to enter into the gas flow inlet, pass through a gas flow passage in the annular cavity, and be discharged via the gas flow outlet.

The invention claimed is: 
     
       1. A heating device for an annular component, configured to heat the annular component via hot gas flow, comprising a gas flow heater, a draught fan, and a hollow annular cavity configured to accommodate the annular component, wherein an outer wall of the annular cavity is provided with a gas flow inlet and a gas flow outlet, the draught fan is arranged between the gas flow inlet and the gas flow outlet and is arranged outside the hollow annular cavity, the gas flow heater is arranged inside or outside the hollow annular cavity, the gas flow heater heats a gas flow, and the draught fan enables the gas flow to enter into the gas flow inlet, pass through a gas flow passage in the annular cavity, and be discharged via the gas flow outlet,
 wherein the annular cavity is formed by engaging an upper annular cavity and a lower annular cavity, the upper annular cavity is formed by engaging a plurality of upper annular cavity units, and the lower annular cavity is formed by engaging a plurality of lower annular cavity units. 
 
     
     
       2. The heating device for the annular component according to  claim 1 , wherein a guiding member is provided in the annular cavity, and the guiding member is configured to guide the gas flow to move along a surface of the annular component. 
     
     
       3. The heating device for the annular component according to  claim 2 , wherein the guiding member is a guiding spiral rib structure. 
     
     
       4. The heating device for the annular component according to  claim 3 , wherein the gas flow heater heats the gas flow before the gas flow enters into the gas flow passage in the annular cavity. 
     
     
       5. The heating device for the annular component according to  claim 4 , wherein,
 a pitch of the guiding spiral rib structure is decreased from the gas flow inlet to the gas flow outlet; and/or 
 a spiral angle of the guiding spiral rib structure is increased from the gas flow inlet to the gas flow outlet; and/or 
 half of thread angle of the guiding spiral rib structure is decreased from the gas flow inlet to the gas flow outlet. 
 
     
     
       6. The heating device for the annular component according to  claim 3 , wherein any one or more of the pitch, the spiral angle, and the half of thread angle, of the guiding spiral rib structure varies to allow a change trend of a surface heat transfer coefficient to be opposite to a change trend of a temperature of the gas flow in the gas flow passage. 
     
     
       7. The heating device for the annular component according to  claim 3 , wherein the guiding spiral rib structure is integrally formed on an inner wall of the annular cavity. 
     
     
       8. The heating device for the annular component according to  claim 3 , wherein in the annular cavity, two gas flow passages with a same length are formed between the gas flow inlet and the gas flow outlet, the guiding spiral rib structures of the two gas flow passages are symmetrical about an axis, and the axis of symmetry is a straight line in which the gas flow inlet and the gas flow outlet are. 
     
     
       9. The heating device for the annular component according to  claim 1 , wherein the gas flow inlet and the gas flow outlet are arranged in an outer wall of an inner ring of the annular cavity, the gas flow heater and the draught fan are arranged at an inner side of the annular cavity, and a closed gas flow circulation passage is formed between the gas flow inlet, the inner cavity of the annular cavity, the gas flow outlet, the draught fan and the gas flow heater. 
     
     
       10. The heating device for the annular component according to  claim 9 , wherein in the annular cavity, two gas flow passages with a same length are formed between the gas flow inlet and the gas flow outlet. 
     
     
       11. The heating device for the annular component according to  claim 9 , wherein the gas flow is air flow, and an air filter is provided at the gas flow outlet.